T] is narrow compared with the slit width or ideally close to a Dirac delta function, then the SRF approximates to a triangle function with a bandwidth (FWHM, Full Width at Half Maximum) equivalent to a in image plane coordinate.

The integral [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is intermediate quadratic approximation of the integral [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the Dirac delta function, (Butkovskij, 1982).

We present solutions of Burgers equation subject to an instantaneous point input, which is a Dirac delta function to represent the instant negative pressure (suction) applied to the soil around the sampler.

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